Don't worry about it, it was a serious issue and I don't blame you for feeling discouraged.
My dad was the same, he'd constantly call his family since he was feeling lonesome, he'd even try to bond with my older brother, he and my dad haven't been on good terms for years. Yeah, I'd just make your dad feel more comfortable around home and doing common house chores could help him out, less stress and everything.
She was taken by surprise, I assume your mother was taken away by surprise too, but thank you, it sucks that your friend also had to go through that, It's never good losing someone who helped make you, I'm glad you're able to get over the loss quickly, took me about month to completely get over my mom, different times for different people I guess, I know the social awkwardness feelings, I'm quite socially awkward myself so it's understandable.
I'm still sorry for the loss and hope that everyone is able to recover properly :c