Always by each others side

4 kids that have been in foster care but however their mum died when the youngest was born and their dad left when they found out we were having a 4th child So the youngest grew up with no mum but a nice man took them under his wing since he was one of the brothers friends but he didn't put them on the adoption system he treated them like his actual kids, since they were here their whole life and the youngest had never met dad, she always calls the nice man dad even though they aren't on the adoption system they still have had families interested in adopting her and her brother but the nice man always made them change their mind.