Dear Luke:

“It kind of stand to reason that he should see a professional to learn how to deal with things like a normal person. Or should we just keep going like it always has and then the next thing happens”-

– depending on what the next thing is (the italicized). All you shared so far is that he cheated on your mother (one event,  likely more than one), kept it a secret and later lied about it. You didn’t share yet what it is that he did and still does wrong to you and to your sister and to your mother. In your most recent post you suggested that he hit your mother (“hitting my Mum”). You didn’t share that before. Do you mean that he physically hit your mother?

Clearly if he sometimes hits your mother or you, or your sister, neither one of you should be in his physical presence, whether he goes to therapy or not, and you shouldn’t be in his presence (talking to him about no longer hitting other people).

So what is it that he did and is likely to be doing against you and others during Christmas let’s say, the next time you plan on spending time with him in his home?

anita