Children's book help

Wh

I am going to be a new mom in October. My fiancé and myself sat down today and made a big list of books we wanted for our baby and some of the books will be for when baby is older. We realized what happens when our baby asks why they have grandpas but no grandmas. To clarify we both lost our mothers back in 2014 and our dads are not remarried. We went our kids to know their grandmas but how do we do this?

Edit:I'm asking does anyone know of any books that could help wit this?