There is no right or wrong way to feel about this
+1
“Family” is a funny thing. There’s an adage that “blood is thicker than water” but it’s a BS platitude. You care about who you care about and that’s largely based on social interaction.
For me, my dad passed last year after a self-inflicted illness lasting a few years, and given the circumstances surrounding that and given our relationship has been rocky for as long as I can remember my only real emotion is one of relief. Conversely, my mum has been tenaciously hanging on to life since before my dad was ill and when she passes I’ll be destroyed. It’s not about genetic relationships, it’s all about the times and lives you’ve shared.
And that aside, people deal with grief in different ways. Shock, denial, anger, heartbreak, apathy… as RN said, there’s no “right way” here, we all have to find our paths and that’s ok. Whatever you do, please don’t beat yourself up over it, you have no control over how you feel and there’s no wrong way to do so.
There’s also no time frame attached here. Some folk react immediately. Maybe you’ll feel different in a couple of months, or a couple of years, or not at all. And that’s fine too.