DH has just asked me to get DS (6) to sign Dh' mums MDay card.
The very first sentence implies DH is signing as its 'dh's mums MDat card'
If it was from it all of us then maybe. But DH doesn't usually put my name at all.
Strongly suggests it is just OP not on the card
Dramatical, I wouldn't have an issue if the card was just DH. Seems a bit weird if it is just DH and DS or just DS.
This refers to it being DH and DS, the last bit is referring to previous comments about DS giving a card just from him (a grandma card)
I don't care about not being on the card. I just think it is strange for MIL to recieve a card off my son instead of her own. As well as - fine. But instead of, just seems a bit weird.
I missed this, but it goes against what OP has previously said 
I agree I shouldn't be included but I don't think it should be DS on the card either.
This kind of implies the DH is signing otherwise OP wouldn't be talking of inclusion .
But maybe I read it all wrong? Picking it apart there it actually looks like initially the OP was saying the card was from the DH and he was getting the DS to sign as well. Since being told how ridiculous her annoyance is, OP seems to be suggesting that the card is only from her DS 