I would be honest to say [name_f]Patricia[/name_f] and [name_f]Beatrice[/name_f] are the most beautiful version of names to me, but understandable if you want to honor your relatives more.
[name_f][/name_f]I think both [name_f]Patricia[/name_f] and [name_f]Beatrice[/name_f] flow badly with Mercier, tho.
[name_f]Odette[/name_f] [name_f]Patricia[/name_f] [name_f]Bea[/name_f] Mercier [name_f][/name_f]- flow is fine here, so that would be my suggestions.
[name_f][/name_f]other ideas for you, if you want to use different names [name_f][/name_f]- [name_f]Beatriz[/name_f], [name_f]Patty[/name_f], [name_f]Trish[/name_f] (nickname for both [name_f]Beatrice[/name_f] and Patricia)