Very good Question. I do agree those people exist who after Marriage give more Attention to their Wife than their Mom. But getting Married Definitely DOES NOT mean that Your Love & Attention will shift on Your Wife and Your Responsibilities towards your Mom will be over.
And this is also true that your Wife is Your Life partner but Don't forget it's Your Mom only who give you LIFE.
So one should keep a balance of giving Attention, Love, & Respect to both of them.