[Rails] Association count sorting

I have 3 models GrandPa, Pa, Kid

GrandPa => has_many :pas
Pa => has_many kids

When I list GrandPa I would like to present the following

*********************************************
1 - GrandPa_Name

2 - List of Pas sorted by the number kids each pa has in descending
order
**********************************************

How do I accomplish #2?

Thanks

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