Babysitting question for you

bluesapph

Hi, this is my first time posting on this board.  I'm hoping you mamas can help me out with advice or suggestions.  I will be babysitting for a neighbour.  Our boys are 9 and 11 months old.  What should I expect with 2 this age?  Obviously they'll both be active and getting in to things and nap schedules may not overlap.  (The 11 month old is transitioning to 1 nap it appears.)  Any tips?  Anything I should know? The boys know each other and are used to each other but they are both first born children and neither are used to sharing attention.