Well, at least your bf has his degree and a stable job. Perhaps
there is some misunderstanding.
I think it is important your bf don't have dinner too often at
your house.
Your brother may feel that his privacy is being invaded, since
he is still living with your parents. Guys can be rather
territorial.
Granted your mom did invite him to dinner at home, your brother
may not be aware of it...still ...It is not a good idea for a
guy to be feeding off the girl's family.
How often does your bf treat your parents/family to dinner ? Is
there an exchange of kindness , or is your
boyfriend just enjoying the goodies offered ?
You must understand that he is your bf, he is not your brother's
bf, nor is he part of your family yet.
Treat your bf like a family member AFTER he formally becomes a
family member.
Like what our parents always tells us.. " why buy the cow when
the milk is free "
Actually he used to eat before coming over to my place.. And
maybe from time to time, I will dine outside with him. Perhaps my
mum feels that outside food is not so healthy, so she invited him
to come daily. Sometimes, he would bring some gifts ocassionally as
well, and even scarier amt when we travel back to his hometown.
And, It has been a routine that we walk my dog every evening, so it
is not exactly seen as he come over just for free food.
We used to stay below and play with my dog, and never enter my
place. I was hoping for the situation to improve if he goes over
more often..
Just an example, if your boyfriend is the kind who like to stay
overnight in your house often and every morning he woke up early
and have to "fight" with the washroom with your brother who also
need to wake up early for work and need to use the washroom, your
bf have an habit of using your home's thing like PC as if it is
really his home, try to do thing to grab your mother or other
family members "good books" and make your brother look "bad" (We
all know the story how parent also like to compare their own
children with other "talent" people and say son/daughter how come
you cannot be like that boy next door who is an "A" grade
student.)
Anyway, if your BF has a sister and his sister's BF do the
"same" thing in his parent's house, maybe he will see the error of
his way. 
Well, my BF dun really chat with my family, except talking bout
games with my younger bro.. and sometimes with my mum.. So, I'm not
sure in any other aspect there is any misunderstanding.
One significant difference is that when my BF is around, he
would put on his top.
IMO, for basic respect for the females in the house, guys shld
be dressed properly at all times...?
Nope, my BF doesnt have a sister..
