And is it big enough?

DH and I just found a perfect house in our target school district but the back yard is on the small side. Hard to describe the size exactly, but it would easily fit a swing set and patio with some grass left over but no sports could be played since balls would definitely go into the neighbors yards.

DH is gung ho on making an offer, but I think we need a bigger yard. Hoping to hear what "big enough" means to others!