Have you obliged to someone?

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I have a friend.She is too kind to me and to my family.She is headmaster in my school where I am teach.She ask me to inhabit her house that empty, by free.Actually,I don't have blood relation with her.But,she is very kind to us.Honestly,I confuse now.we want to live at she's house but My husband and I worry about moral duty.What do you think friend.Help me to thingking about it.Have you obliged to someone?.Thank you so much.