selfless behaviour

to have sb's (best) interests at heart - care about sb and want to improve their situation

My mother has my family's best interests at heart.

to go out of your way (to do sth) - do sth you do not have to do and that involves making a special effort.

My father will go out of his way to help his children.

to go to great lengths to do sth - try in a determinded way to achieve sth

I will go to great lengths to be a student in that school.

hold sth together - keep a group of people, a marriage, etc united in difficult circumstances

I can't understand how did my parents fell in love with each other when they was young. I have spent almost my childhood to hold their marriage together.

to be there for sb - be available and supportive if sb wants to talk to you or needs your help.

I will always be there for you.

to turn to sb/sth - go to sb/sth for help or advice.

I always turn to my math teacher when I need a piece of advice for my study.

a shoulder to cry on - a person who gives you sympathy

I don't have any shoulder to cry on.

to set sb apart (from sb) - make sb different from or better than others

Her linguistic skills set she apart from her friends.

thank your lucky stars - feel very grateful and lucky about sth

I thank my lucky stars that I have a family.