Is it normal if my older female cousin pats my ass

i m a 27 year old guy .this is about my cousin who is 5 years older than me..married for the last nine years and has one 6-7 year old boy
this thing happened 2 years back at a small family get together sort of a thing i was just standing she came from behind and patted my ass like very fast
not the slow and feely type
so i jst want to know why she did this?
4-5 years back once i was standing beside her she just started playing with me like to raise our hands and all during that play my arm brushed against her right boob i saw it completely and felt it too omg
i still remember the bounce and then i looked at her she didnt say anything like it was all normal
we both knew wat happened but didnt talk about it
she has got very big boobs and a nice fuckable body
but she always remains covered in front of me never shows her cleavage and all
now tell me