Yume No Kodomo? Though not sure if it fits since haven't read it myself but the start seems kinda similar to what you said.
http://www.mangago.me/read-manga/yume_no_kodomo/
If not I'll try to keep a lookout for it ^^ you could always try searching the tags too, like writer or housekeeper to try to find it. (still no easy task tho ^^')
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