Romans 13,14

The person who loves has fulfilled the law. If you love (your neighbor, your spouse, your enemy etc.) you will have conducted yourself in a manner that pleases God and removes the necessity to abide by rules of conduct.

It’s really very simple. Let love be your primary motive in all that you do. If you have trouble loving someone, allow God’s love for that person to flow through you. Treat them like a loving parent.