Much energy has gone into figuring out where the Miliband brothers stand on the Jewish spectrum. For the most part, they show few signs of anything beyond a cursory interest in their Jewish heritage, they are uninvolved in the community, neither of their partners are Jewish and relatively little is known about their positions on Israel.
So here is another element to throw into the mix. According to the BBC and Haaretz, the Milibands' mother, Marion Kozak, is a "a leading member of the Jews for Justice for Palestinians", the group which is on the very margins of the Jewish community.
It is actually unclear just how "leading" she is and what real role she might play. But she certainly is a signatory.