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Well, I read the OP differently, as suggesting that we should assume he is at home as we see him at work with an emphasis onnhis positive qualities, not the negative effects of his addiction-driven behavior. And also contrasting his presumed parenting (we shouldn't assume he's bad but rather loving and engaged) with his presumed behavior toward his wife (he's probably checked out) - both of which are highly speculative.
I don't know if OP was responding to something I haven't seen but most of the comments I've seen on this show seem to presume that he's either an evil druggie or father of the year and I hate both of those takes because the reality is almost inevitably much more complex. You can be very loving and still be a "bad" parent because of addiction.
Of course my thoughts are speculative - so are OP's. We have seen him have one brief interaction with one of his children of which we only see his side.
You could as easily extrapolate from the canon fact that we have seen him put patients at risk at work through drug diversion and say that he'd likely make similar decisions at home that could affect his children.
frank langdon isn't a bad dad because the whole point is that he's an addict that doesn't "appear" to be an addict. he's functional, he's alert, he is focused and engaged and yes, at times, erratic on account of the drugs in his veins but he is always present and if he's that way in the e.r., it stands to reason that he would be that way at home too. he's probably a bad husband to his wife because they don't want to be with each other. if we're being honest. that tends to make you a bit shit at things, when you have to do them and you don't wanna. but he wants to be a dad. he wears his kid's bracelet on his wrist. he calls them just to hear their little voices. he's locked in on the dad thing and, finally, i think that if you're a person who is analyzing the pitt and the conclusion you come to is that frank is a drug addict ergo frank is a bad dad then i think that speaks more to a subconscious and unjustified association between addiction (an illness) and one's personal value to the tune of addicts have no distinguishable personhood outside of their addiction and non-addicts do which is probably not great but understandable considering how disdainful and hateful the world at large is to addiction as a concept. anyway.