The incest mother sent the clips of “full intercourse” to a cousin in Pakistan along with indecent photos of her three-year-old daughter.
The mum-of-four’s disgusting crime only came to light when one of her daughters borrowed her son’s phone and found the clips.
The paedo’s eldest daughter said in court: “I worry about my mum”.
Prosecutor Ian Kolvin said the first of the videos showed oral s*x and other s*x acts between the mum and son.
Mr Kolvin said: “She was telling him to take the video. It shows full intercourse.
“It showed the son with his naked mother, rubbing her breasts and vaginal area.”
When the police seized her mobile phone they discovered indecent images not only of her son but also of her three-year-old daughter.
Her cousin in Pakistan allegedly asked her to make and send the sickening videos and images.
Mr Kolvin said the woman from St Mellons, Cardiff, told police she agreed to making the videos to please her cousin.
The incest paedo and her children cannot be named for legal reasons.
Her son, in a victim impact statement read to the court, said: “I feel upset and ashamed of what she did. She should not have done it but I miss her very much.”
The mum admitted six counts including sexual activity with a family member, taking and distributing indecent images of a child reflecting 119 images, and three movies.
She has been sent down for five years.