Any spoiler for the novel readers

yes he will

Thank you so much ahhahaha you could spoil me of its okay id appreciate it hahahha

Grandpa lives to the end of the story; he even gets to hear about Tia's pregnancy. Tia does take over the household properly, though there is also a whole thing with Tia and Perez being married, and Tia's family being so powerful that it would make the monarchy too powerful, as she is still the head of her family.