Husbands, love your wives, just as Christ loved the church and gave himself up for her (Eph 5?25)
Don't care if you're religious or not, there's a valid premise there. The story of Jesus is that He is God who gave up his comfort to suffer and die for humanity. As a husband, I have had to give up quite a bit. I used to have hobbies. As I got married, had children, and have prioritized things in life. I no longer have the time to do my own thing as often as I want.
Your father should better prioritize his time. A father's role impacts the family in ways that we're understanding more and more as there's an increase in fatherless homes.
Divorcing won't help your mom's situation. It'll just splinter the family and leave more issues with your siblings.
Your parents need counseling. It's possible that your mother may be contributing to your father's avoidance in some way.