What is your impression of Holden's father?

Very hard to say. Holden seems to dismiss his mother as almost an abstract. He has no complaints about her, and he also has no praise for her. The reader gets the impression that he does think she is an Excellent mother to Phoebe, and Holden is genuinely concerned about what his mother's reaction will be when she finds out he "got the axe again". The most specific thing Holden tells us about his mother is that she is very nervous, "half the time she's up all night smoking cigarettes".