Families are not to be relied upon to do the hard graft such as weeding, though small children love digging holes.
I’d say half or even quarter an allotment. Plant soft fruit such as respberries, gooseberries, blueberries, small plum and apple tree. These don’t take as much looking after.
Big patch for potatoes (earlier especially) beans, peas, courgettes, sweet corn, beetroot, carrots, leeks, garlic, shallots, etc..I had an asparagus patch which is producing just now.
Yes, flowers. Daffodils, lavender, and others to attract the pollinators. I have these interspersed with the veg. Ask other allotment holders for help and advice. They are usually only too willing to give it.
Find out what they grown and what species. Find out about rotation.
And make sure you label everything! Or it ends up likevmy freezer.....not quite sure what’s what ?