Does shaking hands with the bride's paternal aunt, maternal aunt, grandmother, and sisters invalidate wudu', and is it permissible?

Shaking hands does not nullify ablution (wudu’). The paternal aunt of the wife, her maternal aunt, and her sister are not considered unmarriageable kin (mahram). Therefore, it is impermissible to shake hands with them or to be in seclusion with them, as they are considered non-mahram women (ajnabiyyat). The prohibition of marrying them is temporary and has no bearing on these matters.