Dear Francis:
“They are extremely close together and never .. want to hang out.. I’ve always been protective and loving because our mom doesn’t live with us so I help as much as I can“- maybe your two younger sisters think of you- not as a slightly older sister- but as a mother (the only mother figure present in the home). It is almost always the case that 16 and 20-year-old girls don’t want to hang out with their mothers. Could this be the reason that you are “left out of everything“?
anita