Build all the love and interaction between them that you can while they are very young … it'll all be necessary when they get into their teens to keep the lines of communication open. Try not to blame them when they get to that stage … just remember what you were like at that age. Being a good father is as much looking back as it is looking forward. There will be times when you hate to be the disciplinarian, but if you love them enough, you will do it …. but there are boundaries that apply to you as well as them. Best of luck to you and them, it's a hard row to hoe, but worth every minute of it!