I love my DM but I want to throttle her.
My DF died just over two years ago unexpectedly from cancer.
Mum started online dating about 9 months ago. She is very codependent and admits this. She moved in with my dad (technically step DF) after two weeks.
Anyway she has met this man online and they have been chatting for five weeks and met once. We have not met him.
Today I find out that he is moving in with her 
They have met once. He could be an down right weirdo serial killing cocklodger for all I know. She says she is happy but really? After one meeting? After three months here they are legally recognised as de facto and can take 1/2 of all possessions if they split. DM says they are having legal documents drawn up but still.....
I know DM is an adult and can make her own decisions but she really needs to sort out her life first. Find friends, join groups, etc not move in with the first bloke she meets.
Honestly I feel this is going to go very badly.
So do I just smile and get ready to pick up the pieces?