I tried to say this before, but don't think I put my poin across. It's like everybun has a happiness quota, like every single bun in the world is allowed 300 days of happiness. Many buns will never get up to that much
Some buns, like your cousins', haven't had their quota yet, so the big guy upstairs lets them carry on living, hoping one day they get their full quota.
But Locksley was such a lucky boy he got all his happiness quota early, so God took him. And if God had let Locksley keep living over his quota, he would have started using up other bunny's quotas. Or, God would have had to stop Locksley being happy, and had to make him poorly or something to make him not use up any more happiness. And you wouldn't have wanted either of those things.
Plus, God has seen how good you are at filling bunny's quotas, so he wanted to make sure you had room in your life for another bunny who needs to make up his quota.
I also think that's why mowgli had his problems, like with his eyes. God could see that mowgli was gonna get to his quota too quickly because he was so happy with you, but he wanted to give you extra time with him, so he made mowgli's eyes sore so he used up his quota less quickly.
Does that make sense? xx