Answer:
Mis abuelos me llamaban todos los sabados.
Explanation:
Llamaron would translate as "call" which would be "My grandparents call me every Saturday" - which doesn't make a lot of sense in this context.
Llamaban would be the one right.
Native speaker over here.
“Lo” means “it” but it can also have other meanings depending on what you are saying.
For the most part it means “it”
1) lo
2) la
3)las
4)los
5) los
6)se
7) se
8) se
9)te
10) se
