Kashmir, Dalhousie-Amritsar, Shimla- Manali, Darjeeling- Gangtok, Kodaikanal-Mysore these are very good places in July as that time it is very hot weather.
There a lot of options. You can go Manali/Shimla/Dalhousie in Himachal Pradesh. You can go to Rishikesh/Haridwar/Rudra-prayag/Badrinath in Uttrakhand. You can go to Jammu. Then also you can go to North east indian states.
My family went to Gangtok and Darjeeling You’ll have loads of fun with the family Though there are other places too
Nainital,Corbett,Rishikesh,Manali,Ooty,Coorg
Chikmanglur, coorg, medikeri, wayanad, mysore, sravanabelagola, sakleshpur, gokarna (its a travelers hub and very family type on few beaches)- karnataka
matheran - Maharashtra