Mother is always a mother, Our life is God gift, our mother also a God gift. Love our mother means we love our God.Without mother or father, we can't see this world. Only two persons came to this world with out mother or father. Prophet Adam a.s came without mother and father, Jesus son of Mary (Prophet Isa a.s Ibni Mariam ) without a father. Other than that must have mother & Father.
In Islam, a baby come to this world considered have no father if their parents live together without marriage (akad). For non muslim converted to islam, the marriage before islam, accepted by God (Allah) means the son or daughter considered have father.
On the judgement day (according to Islam) we will base on our mother, not from our father like we live in this world, because only mother know who is the father of the son or daughter. So love our mother, don't ever rise our voice to her. She bring us every where she went in her for nine months and 10 days. Only a mother can did that. A weak human with a strong heart, she is our mother.
note: Ibni in arabic means son of.