What is wrong if his mother wants to stay with him since her son is sick?

This man was getting on everyone's nerves.

"Wow, Miss Xiver, you're getting beautiful every day." A voice interrupted them. They turned and looked at the man who appeared out of nowhere.

Mike walked in with a big bouquet and walked to Nina. "Welcome home, Miss Xiver." He said cheerfully; his words surprised everyone. Home; this was not Nina's home; she was there for her son; what he was saying, how could he welcome her