It depends a bit on your crop mix, yield, and of course, family size.
You'd be surprised how much some crops can yield in small areas. (Oh god, I used to actually like pickles before I realized how many cucumbers we were churning out last year.)
Where it gets space-intensive tend to be grain crops, which we don't currently grow because the ROI is so low, but have space to if life forced it on us. Protein can also be a little tricky depending on what your expectations are, but if you're okay with mostly beans and eggs, you'll be alright on well less than an acre for a small family.
You'd be surprised how much some crops can yield in small areas. (Oh god, I used to actually like pickles before I realized how many cucumbers we were churning out last year.)
Where it gets space-intensive tend to be grain crops, which we don't currently grow because the ROI is so low, but have space to if life forced it on us. Protein can also be a little tricky depending on what your expectations are, but if you're okay with mostly beans and eggs, you'll be alright on well less than an acre for a small family.