In the words of the late Johnny Cash, “Nothing has ever been found that’s stronger than love”. The love between a parent and child is often very strong but not always reciprocal to the point of honesty.
I can say that what love is not; an emotion. One can express love, give love, make love, be in love, feel love etc., opposing this is fear.
When a couple are said to be in love they often get married, which is a contract between them that places certain conditions and restrictions on the relationship. This is not how unconditional love should look like.
The love that God has for everyone and everything is unconditional.