Yeah the tomcat Trouble is twice the size and more than his runt sister Shiloh and he outweighs her by ten pounds at least but they are from the same litter in which he was the biggest and she, as the lone female, was the smallest.
You sometimes think that cats are loners and don't have feelings or loyalty or are capable of love - but you'd be wrong. I watched these siblings groom each other for a bit the other day before little Sweet Babycakes crashed for a nap. Her big brother pawed her head gently (claws in) and dropped next to her.
This be feline love (yeah, they're neutered). And they are both asleep in this photo.