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Your son has always loved you, until he reached an age where he, as is normal, also needs a role model, his dad.
Suddenly he's all confused, because his dad is mean (is that the right word?) to you,...

Yes. Of course. Take your fights elsewhere, even if you have to get a babysitter.

Make dates at home too, to sit down with a drink or tea to talk quietly, when the kids are asleep. Pretend...