Yes you should start talking to him
In the English language there is no difference between the wife of an elder brother and the wife of a younger brother or of a twin brother. The wife of any brother is your sister-in-law. If you are actually talking to her, however you should just call her by her name. Nicknames are fine too.
There is technically no difference, but I would use them slightly differently. The first would be that one should not start talking, the second would be the thought that someone talking should not be. The doctor said she should not talk. The terrible things she said made him think she should not be talking.
ask him out
It mostly depends on age difference.
If you are talking about getting up from sleeping, it should be about 8 hours from the time you went to bed. The younger you are, you need more than 8 hours.
He should look for someone his own age as it would be inappropriate to date someone so young at his age. If he keeps his younger boyfriend then he must make sure there is no sexual relationship until the younger boy reaches the age of consent for homosexuals.
If it bugs you sooo much you should just tell him that you aren't really intersted in it and you don't want to talk about it.Maby he will stop talking about it to you. move
there is no such things as who should be older or younger.. it is about wheter you like her/him or not...wheter he is older then you by 20 or younger then 20, a lovely couple will always stay to be a lovely couple.
You have already surpassed some experiences that she may not have yet and it certainly depends on just how much younger your talking. If you find this then maybe you should try dating girls that are your age or older - its sounds as though this would be more suitable for you.
The younger woman
they should be talking about stuff
If you want to be not owned by bullies and such, then yes. If your brother is a bully, start bringing a taser. If your older brother is drunk, then dont go with him. It really depends.