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Emissary archtypes give the ability
Share Will (Su)
Whenever an emissary or its master fails a save against a mind-affecting effect that affects only one of them, the other can choose to attempt the save as well.
If this second save succeeds, treat the original save result as a success, and the emissary and its master can’t use this ability again for 24 hours. On a failure, both the emissary and its master suffer the effects of the failed saving throw, even if one of them wouldn’t ordinarily be a valid target.
This ability replaces share spells.
now a player of mine has a Ioun Wyrd familiar with this archtype. he is claiming that because this ability allows his familiar to attempt the save and is immune to mind affecting effects. does it do that or does it just give him a extra saving throw without the immunity
Since the ability specifies that on a failed second save they both suffer even if one wouldn't ordinarily be valid, I think by choosing to invoke the ability the ioun wyrd has made itself vulnerable. It gets a save, and if it fails both it and its master are affected.
That's just a guess, but you certainly shouldn't let the ability make the PC immune to mind-affecting effects.