Question

My parents were widely regarded as an ideal couple. (voice change)

Answer 1

". ‘My parents were widely regarded as an ideal couple.’

This sentence is in passive voice and it has to be changed into active voice.

While changing from passive voice to active voice, subject and object replace each other, so the sentence would be like,

‘People regarded my parents as an ideal couple.’

"

Answer 2

People widely regarded my parents as an ideal couple.
As it is evidable in this case that they were people who regarded them as the ideal couple. So we used people here,in most of the cases we use $'someone'$ instead.