I don't think it's strange at all ! I think not everyone has that closeness , some by choice , some not by choice , some because it's just not how their family is but I don't think it's strange. However I've found some people are abit taken aback by my closeness to my dad and sister if their family dynamic is different, where to us it's very normal .
I see both my dad and sister very regularly plus daily texts and phone calls, emails and convo's on words with friends etc . The bond I have with my father I cherish and is indescribable . The bond I have with my sister is just beautiful . I feel very lucky .
My mother is passed away that's why I haven't mentioned her . I am however very close to her sister (my aunty ) and her mum (my nan).