The problem is not a bigger house, but Hayley having a complex. What has she done? Where did she attend school? What has she acheived? Good mom, yes. But Hayley is selfish and self serving. Those kids are not her mom's but she and Robert's.
She appears only to want to make life easy for Hayley and sets a bad example for the little girl who she claims shows selfish behavior. Heck I wonder why? Where on earth did she learn that? When you work there are things you can't do. Robert is trying , but Hayley wants everything when she wants it and I'm as sick of her right now as I was of that darn Holly begging Hef to marry her everytime you look up.
Robert might want to consider getting a good lawyer and custody rights and letting this selfish woman stew in her own juices.