She may no longer be comfortable with hugs and cuddles she enjoyed so much as a child. It is important to respect this as well as your daughter's increasing need for privacy. Acting in a caring way, showing interest in what she does and using affectionate words and tone of voice still show that you love her. They watch how you act and copy you in their play and when interacting with their friends. It is important she sees you acting in a caring and respectful way with your partner.
Most fathers are anxious and protective when their daughter begins dating.
It is normal for her to become interested in boys and develop close relationships as she grows up to be a young adult. She needs your support rather than heavy vetting of boyfriends. Try to allow your daughter to make her own decisions about boyfriends and be ready to listen to her when she needs someone to talk to. Your son is observing you closely and copying your behaviour in day to day activities. It is important to think about what you would like him to learn.