For the sake of any poor confused souls, we'll start from the beginning...
May X817
~Liddan and Malcon travel with their families to Fitlyn Ports to work an S class job. Liddan and Malcon sperate from the group and meet Marigold, who was fleeing from the man Liddan had come to capture for his job.
~Marigold is saved by Liddan, and he offers to bring her to Fairy Tail.
~We are introduced to Nashi Dragneel, the oldest child of the Dragneel family, and Gideon Fullbuster, son of Gray and Juvia.
~Nashi and Marigold begin to live together.
~Liddan, Marigold, Nashi, and Malcon take a job in Maniford involving a guild known as Redmoon Shield. The guild matter possesses Blood Puppet Magic which controls is victims through a source of blood. Nashi and Malcon are captured she become puppets of the guild master.
~Marigold and Liddan discover the one behind the puppet magic was a young woman named Alexandra who wanted revenge against the guild for how it wronged her family. She killed the true master (which was also her grandpa...weird) and taken over the minds of the entire guild.
~Marigold reasons with Alexandra and she releases all those under her control. But the guild turned out to like her and has her be the new master since she was the old one's grandchild.
June X817
~Team returns to Fairy Tail. Nashi and Marigold are still roommates.
~Liddan and Malcon discover that Marigold had secretly created a garden for her magic. They come up with the idea of giving her her own house at the same spot so she didn't have to travel out so far just to visit her garden.
~Laurie builds a house for Marigold on request of Liddan. Marigold is pleased with the house, and thanks them happily.
~Lucy receives a letter from the Love & Lucky, announcing that something corresponding with her book Thought Monster.
~Lucy hires Marigold to babysit her youngest son Jude as she, Natsu, Gray, Erza, Happy, and Carla all travel to the Love & Lucky on the job.
~We meet Jude, the youngest Dragneel, who is a young 9 year old boy. Marigold quickly finds herself in adoration of the small boy, and the two become friends.
~Team Natsu arrives at the Love & Lucky. They investigate the incident by individually interviewing the workers at the guild. They find a man who had lied about his magic type, and discover he had been working for a dark guild.
~We learn Marigold had traveled to countless places after she left home. Carla and Happy will soon have a child, and Jude is not well liked at the guild because he's perceived as a brat.
~Team Natus goes after the dark guild that had robbed the Love & Lucky. They are then separated and captured. Erza fights against the boss, who is none other than Carson Bradley, the man who attempted to kidnap Marigold in the first chapter.
~Erza defeats Carson, and frees Team Natsu. They return home to find Jude much less bratty, and also good friends with Marigold.
~Gray returns home to find Gideon snuck out to hang with Nashi, leaving his twin sister Sylvie alone all day.
~Sylvie, who makes it rain wherever she goes, goes to the guild.
~Nashi discovers her presence and attacks her. The two quickly fight and Sylvie traps her in a ice shell. Nashi escapes using her apparent Sun Dragon Slaying magic.
~Sylvie runs away, unintentionally to Marigold's house. The two speak and quickly become friends.
~Nashi comes to Marigold's home, and we discover he reason Sylvie hates Nashi is because she thinks that Nashi is in love with her brother Gideon.
~Nashi vigorously denies everything and the two make a truce. Sylvie joins Fairy Tail officially.
~We learn that Nashi was kidnapped as a child, and had her powers mutated into Sun Dragon Slaying Magic. She was saved by Gideon, who scarred her with his attack. Along with that, we learn Gideon is in love with Nashi.
~Psycho is born to Carla and Happy. She also has Carla's ability to see into the future.
~Marigold is kidnapped by a dark guild for unknown reasons, being beaten severely. Liddan saves her-getting into the habit of saving her-and Marigold is drastically injured for sometime.
~We meet Layla and Xavier (Miraxus) who had been traveling with the Thunder Legion for several months.
~Marigold explains the love story between her parents to Layla, who is obsessed with romance of any kind and ships herself and her fellow members of Fairy Tail.
~Marigold wins money for being hot. (Miss Fairy Tail contest)
~Marigold's brother-Coladome-comes to the guild and asks Liddan to watch over her. He also announces his plan to marry Sabrina, a girl that Marigold been somewhat enemies with when Marigold lived in her hometown Pride.
July X817
~We learn that Nashi disappeared when she was a child, returning to Fairy Tail only to destroy the guildhall, and have extremely strong powers known as Sun Dragon Slayer Magic." She is taken out of her trance by Gideon, who by the way, is in love with her.
~Liddan moves in with Marigold after turning 18. Lucy becomes pregnant with triplets. Gideon goes on a job with no warning, worrying Nashi. We learn Sylvie has a weirdly sexual relationship with Laurie.
~Gideon dies on his job.
That's all for volume I! Read on to Volume II to see what happens to them!

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Fairy Tail: Next Generation - Volume I
FanfictionOver two decades after the events in Fairy Tail, witness the adventures of the original heroes' children as they journey through Fiore seeking adventure, glory, and enough money to pay the month's rent. Meet the children of Natsu and Lucy, Nashi and...