Mil from hell *update* - partner lied to about his whole life

Update:

Turns out everything was true and my partner has been lied to about his whole life from almost everyone in his family. The paternity of one of his brothers is also questioned and the step mum is lashing out because her relationship is falling apart. Shes going to raise hell (going to tell his bio mum she knows etc etc, long standing conflict already and shes adding to it).

This time when my partner and i should be celebrating the birth of our daughter in 24 hours or so has been completely shattered with this news. Im scared of him diving into a depression and struggling to bond with his daughter. We are both completely dumb struck.

Ladies.... I don’t know what to say.

My partners step mum has been.... hellish to say the least during the past few years. I had a molar pregnancy 2 years ago, and before we knew we lost our baby she had insulted us quite horrendously for seemingly no reason, bashing our age a where we lived etc.

Now, days away from delivering our rainbow, i have received a message from her. Claiming that my partners ‘dad’ is not his biological father. Claiming that the bio father is someone..... incredibly sadistic and currently jailed for life.

She said her only reason to tell me is so we can be aware of ‘genetic conditions’ if needed.

I am freaking out needless to say and my poor partner is probably as well (not currently with me)

Who would be so cruel to send this to someone who is heavily pregnant, delivering in a matter of days and at 11pm at night!

I cant even right now. 😡😡 im terrified, mad and my anxiety has just sky rocketed.