its more down your your genetics and bone structure than your OH's caus its your body growing the baby
my OH was 6lb 8oz born and i was 7lb 8oz, ds1 was 9lb 10oz and ds2 10lb 12oz lol big babies come through my side of the family my mum has had 2 babies over 10lb. my MIL didnt have a baby over 8lb,
people dont believe me though if they know my OH caus hes 6ft6 and 130kg lol as im 5ft8 and normally about 68kg not pregnant