I saw this a couple of days ago, and was going to respond, but had the weekend with the kids.
I didn’t have my children until I was quite a bit older than most fathers. Before that I was the favorite uncle for my nephew and niece, especially as I have always liked kids, but had figured that I wasn’t going to have any.
There are parent rules and uncle (or aunt) rules. Mostly, since other adults don’t have to worry about what will happen to the kids when they grow up, other relatives don’t have to be a firm. On one visit to my sister’s place when my niece was two, both my sister and her husband were rushing around getting ready for church. My niece was getting hungry, so I fed her some breakfast. I gave her pancakes, well, not pancakes, just cake.
BIL comes into the kitchen and asks “Tokyo, what are you doing?” “Feeding my niece some cake for breakfast.” He leave and not ten seconds left, the cavalry arrives. Sister asks, “Tokyo, what are you doing?” “Feeding my niece some cake for breakfast.” Sister decides that this is the price they pay for having a free baby sitter and leaves.
As a parent, I can’t do that, because it sets up too many precedents. I’m not about ready to set myself up for having a toddler whine at me for weeks “I want cake.” But I don’t care if my kids’ aunts were to do the same thing. Yes, I’d grow, but that’s to let them know that once the aunts leave, we’re back to Bayer rules.
Kids know that different people have different rules and can adapt. Just make sure you keep a good line of communication open with your brother and his wife in case they think you’re going too far.
It’s tremendously valuable for kids to have other adults in their lives who value them. You do not know how cool this is. Kids understand that their parents love them (for the majority of people), having someone else really adds to a child’s development and self confidence.
As the child gets older, they can tell aunts and uncles things which are more difficult for most kids to discuss with parents. But they only do it for adults who have spent time getting to know them. As you are a teacher, you know that time if the most valuable gift you can give.
I’ll echo what others say about babies and being helpful, but with a few differences.
Change diapers. It’s just shit and your hands and cloths are washable. You’ll be surprised how quickly you get used to it.
The advice someone gave me before I became a new father, and which I pass along to all new fathers is something which I think could be useful for you as well.
Babies cry. This is what they do. Many, if not most, fathers panic and give the baby back to the mother. The baby quickly learns that she can’t settle down until she’s with the mother. Unless the baby is crying because she’s hungry, keep holding the baby and have the baby learn how to be comforted by you.
As one of my friend’s pointed out, since we don’t have the right equipment, we can’t cheat and just feed the kid to quiet her. We have to work harder, but it pays off.
Good luck!
And if you are ever in Tokyo, look me up, I can use a good babysitter. 