Ashlee Murrell, 33, said she was comforted by her brother-in-law Chris after her husband of seven years, Michael, suddenly passed away in May.
Less than two months after her husband's death, Mrs Murrell posted photos on social media of her in loving embraces with Chris, 36, which has prompted anger from the brothers' family.
But Mrs Murrell insisted there was no romance with her dead husband's brother - and claimed they were only giving the impression they are a couple for the stability of her three children.
The grieving beauty therapist from Wellington in Somerset said Chris is living with her and her children, but he is sleeping in a spare room.
Speaking exclusively to MailOnline, Mrs Murrell said: 'When Mikey died Chris was the first to come round and support me.
'I was in pieces and he was a massive comfort, not just to me, but the kids as well.
'We saw how well the children were reacting to having him around.