Even though I - and I think all parents have - favourite child(ren) I love them all and I help them all in one way or another. It is completely natural to prefer one over another, but one can show love and care for all.
First, parents can't love kids equally because no two children are identical. Each child's individual personality fosters loving that is unique to him or her. ... Third, the favoritism parents feel for one child over another is usually unconscious, not deliberate.
it is utmost necessary to love them equally, but father loves little more to daughter and mother loves little more to son, this little vary from person to person