like amelie has mother still hot doing yoga and she visit her time to time .What would be the point of adding a other family character ?
She too would need development time and would be slow burn to some degree, cause family, and with the sparse updates it would just slow all other charcaters down.
Rather than adding a other time waste, it would work better with a timeskipp of a couple of weeks, maybe 2-3 months. Add a diashow with some dialogue, that shows how they get slowly closer, live their lives etc.