Here's the thing, it may be in your home, but you can not control what he does. Hes an adult, not your child, so reprimanding him or telling him what he can or can't do on his own phone is something that is going to go in one ear and out the other. It's his loss in the long run - not paying full attention to his kids is going to cause issues later in their relationship with him, if they even choose to have one. Let the cards fall where they may....but keep your mouth shut in the process...
Also take into consideration anything you do say will just be considered jealousy on your part - you really don't want to give him that satisfaction, do you?
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