Is there anything I could do to deal/help my dad with a mental illness & depression?

Maybe send him to a therapist, or you can talk about how you feel, and maybe have some daughter and father time, keep his mind off of it, and when he gets depressed, watch a movie and eat popcorn/candy, just live life! Don't let the bad things ruin it! :)

If there are certain activities that he really enjoys, maybe you and him could do them together to get his mind off of whatever's going on. This could also show him that you support him and are there to help him if he needs any. If it's serious, then I do suggest going to a therapist and being there with him for support on his first visit - then if he feels comfortable and thinks that it will help, you can go back with him or he can go by himself.I wish you and your father the best on this journey! :)

Spend as much time as possible with him. Find out about his illness and seek ways to treat his depression. You could talk to other elders in Family about your dad, they could help you and him. Help him when he needs it, show him that you are there for him. Try to avoid stressing him much. I hope he will get better with time :), but Onething, never take it personally and never blame yourself, however your father is he still loves you, and remember you are very lucky to have him! :)

Whatever you do, don't distance yourself from him, be supportive. When I fell into a depression I naturally became less willing to spend time with others cause I was too caught up in myself, and a couple of years later my dad kinda fell into a depression aswell and both of us are very reserved when it comes to our personal issues. Since then we've kinda grown apart and I feel like his depression is partly my fault and while I would like to do more things with him and become a better son, it doesn't feel appropriate beacuse we're not that close anymore.

I disagree with those telling you to spend MORE time with your dad. Treat him well and be aware of his struggle, but it's important for you to focus on your life as well. All too often we become obsessed with "curing" family members that it turns into a problem more than a help. This happens more with addiction, but I think it's important with any mental illness. This is ultimately his battle, not yours.