Hi guys hope everyone is well!

Sadly my dad got diagnosed with a grade 2 benign brain tumour last year, he has now recently had it removed and is onto 3 months since his surgery, however it just sits in my head that it may come back what happens if it does etc, i was wondering if there were any survivors or anyone who went through something similar ran me through what happens and is there a chance it never comes back or is it inevitable? Scary time and its a horrible feeling especially when hes only in his early 40s.