My second cousins shower together?

my cousins children boy 11 and girl 8 showered together after they went im my pool their mother told my mum "do you think its time they stop doing that"

my mum said "let them be they are kids".

i personally thought this was absolutely fucked since he is almost 1 year away from high school.

regardless i never showered with my sister even at 4 years old. am i being weird about this is this normal?
My second cousins shower together?
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