If it is your sister yes. However, if you are talking about the 15 year old being a boyfriend or girlfriend then no. Thee 18 year old would be coming child molestation which is a crime in most civilized countries.
Yes, it is legal for an 18 year old to date a 15 year old, but it is illegal for an 18 year old to have sex with a 15 year old.
in some states 18 is legal and 15 is underage. legal action can be taking against the 18 year old.
There is no reason why a 15-year-old shouldn't hang out with an 18-year-old as just friends.
To date is legal but having sex is not. The 15 year old parents or anyone can then report the 18 year old for statutory rape.
A 16 year old can with parental permission. A 15 year old cannot.
Yes.
The age of consent in many states is 16 and some are 18. What this means to you is that an 18 can date a 15 year old, but not have a sexual relationship. She/he is still a minor at 15 and the 18 year old is an adult. This means that the 18 year old could be charged with rape should something happen. Check the age of consent for your state.
No, but make sure the 18 year old doesnt go to fast for the 15 year old.
No but the parents of the 15 year old can
It is not illegal for a 15 year old to stay at an 18 year old's house. However, if a 18 year old has sex (or any sexual contact) with someone under 18 he can be prosecuted for it. If they have sex it's called statutory rape.
If the parents give permission the 15 year old can live anywhere they allow.
in the state of illinois can a 18 year old boy get in trouble for getting a 15 year old girl pregnant even if they are in a relationship