There's a 5LL book for children and teenagers. You might want to pick up a copy for yourself so you can learn a few things along the way in relating with your children.
As for texting, I'd like to say that Sandi has a point about "hugs & kisses" as a generic ending. When my mother texts me and my sisters, she ends with a variety of ILY's such as "I love you madly", "To the moon and back" etc. When I see those types of ILYs, I get the warm fuzzies and know that I am truly loved by my mother. I sense it and feel it!