I don't want to get into shipping drama (so ignore this on the shipping debate i'm just trying to explain the connection between Jean and Cable) but Jean does see Cable as her kid.
Cable also has Jean's DNA and he was raised by Jean, the only thing she didn't do was giving birth to him. Maddie was always a Jean replacement and if Jean didn't die it is very likely that she would have been the one to give birth to him.
Given how unstable romances, family and kids are on Marvel it is very unlikely that Jean will ever have and raise another kid. Cable is the closest thing Jean will ever have and the same goes for Cable.
I love the characters and their relationship, it weird but cute.
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