"I have no doubt she did this with the intention of taking her own life and punishing me in the process.
"I know how she behaves when things don't go her way ... it's an extreme version of her character. Knowing how much I loved the children she knew it would be the ultimate punishment for me not going back to her," he added.
Samantha Ford previously admitted two counts of manslaughter by reason of diminished responsibility.
According to reports, she told officers after the crash that it was "all a dream".
"I should have gone to the hospital sooner. He's messing with my head," she reportedly said.
She put the children in the bath and then urged police to check on her home in Westwood, after the crash.
Officers discovered the two children lying dressed in their beds and attempted to resuscitate them, without success.
They found a note on the table, written by her. It said "please forgive my crazy mind".
"This is a tragic and, in some respects, complex case," prosecutor Tom Kark QC said.
"On the night of December 27 last year, the defendant killed her twin children Jake and Chloe Ford.
"They were aged 23 months, and she killed them, it would appear, by drowning them in the bath at the family home in Margate," he said.
"The defendant was charged with murder and on May 28 she entered pleas of not guilty to two counts of murder, but guilty to the offence of manslaughter by reason of diminished responsibility.
"For reasons the court is aware of, those pleas were eventually accepted by the prosecution."
The court heard that she sent a message on Christmas Day to one of her friends that said:
"I just need to end. I just need something to strike him to make him know what he's doing".
The couple met in 2004 and, according to court reports, the woman quickly became increasingly controlling and "occasionally aggressive".
They moved to Qatar in 2008 and spent 10 years living there. It was there that Ford underwent IVF treatment and eventually gave birth to the twins.
"It appears that they had a very good and affluent lifestyle which Samantha very much enjoyed," the prosecutor said.
Their marriage began deteriorating after the couple returned to the UK last year. They split up in November.
After the split, Ford reportedly texted her ex-husband multiple times, telling them the children were now going to grow up "in a miserable cold country" and were "destined to be a miserable family living in a s***hole".
A number of relatives testified they witnessed Samantha Ford's mental health decline after she returned to the UK.
Just days before Christmas last year, she was diagnosed with a "severe depressive disorder".
The prosecutor said there was evidence Ford was a "materialistic person" who "resented losing her good lifestyle in Qatar".
The court heard how, in the days leading up to Boxing Day, Ford was obsessively checking her phone and searching terms such as "drowning children", "overdosing" and "how long does it take to drown someone".
The woman had been facing trial accused of murder, but prosecutors accepted guilty pleas to manslaughter, after her psychiatric reports.
The heartbroken father has posted a series of photos of his children on Twitter, describing them as his "beautiful babies".
WHERE TO GET HELP:
If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call police immediately on 111.
OR IF YOU NEED TO TALK TO SOMEONE ELSE:
• 0800 543 354 (0800 LIFELINE) or free text 4357 (HELP) (available 24/7)
• https://www.lifeline.org.nz/services/suicide-crisis-helpline
• YOUTHLINE: 0800 376 633
• NEED TO TALK? Free call or text 1737 (available 24/7)
• KIDSLINE: 0800 543 754 (available 24/7)
• WHATSUP: 0800 942 8787 (1pm to 11pm)
• DEPRESSION HELPLINE: 0800 111 757 or TEXT 4202
