Naomi Watson was hired by Robert Harris to look after his wife Lisa and kid Molly
But Lisa, who suffered from motor neurone disease, passed away age 41 in 2014
And months later, Naomi and Robert fell in love despite their 20-year age gap
Naomi, from London, said she was branded a 'gold digger' for their romance
The couple of six years, who live in Spain with Molly, 19, have gotten engaged