Here's the deal, I'm about to take my child's father weekends away for awhile. I'm not sure I should…

Here's the deal, I'm about to take my child's father weekends away for awhile. I'm not sure I should because its her father. When its cold outside she never fails to come back from his house sick(cold). He claims she's always sick but I know my child. When she comes back I'm the one who's up all night trying to figure how this happens. I just want to stop them for awhile to see if I'm right.