Glen and Glenda wasn't seen or even mentioned after Seed Of Chucky,so what happened to them?
I don't think Chucky killed Glen,because I don't think Chucky would kill or even hurt his own kid.
So I think,that they are both alive,and Tiffany is raising them while Chucky is off getting his revenge. So,after she mailed Chucky to the Pierce family she went back to her kids. And,maybe when Chucky said "the Tilly's" in Curse,he was mentioning them.And you don't know if he talked about Glen and Glenda with Alice because you don't hear a lot of their conversations.
And also,Curse of Chucky takes place 9 years after Seed. So,Chucky was probably spending time with Glen and Glenda then decided it was time to get full revenge on Sarah and her family.
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Child's Play Theories
De TodoTheory's surrounding the Child's Play franchise,or about one specific character. These theories are ones that Me and my friend thought of.