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Going through passport control after returning from a trip abroad with her three children, Helen Perry was asked how they were related. Her response failed to satisfy the woman in the cubicle, who asked for proof that she was their mother. "I said, 'Well, you could ask the children,' "prompting a sharp rebuke from the woman and a demand for written evidence. "My daughter was nearly in tears, and I said, 'Look, I can't prove that they're my children but here they are.' "The woman let the shaken family through.

Divorced from her children's father and remarried with a new surname, Perry set about finding out what proof she would need to avoid a similar upset. She was astonished to find she'd have to carry seven legal documents. In 2010, Perry launched the Parental Passport Campaign, to end the confusion by adding both parents' names to children's passports.

Perry will be hosting a meeting with MPs at Portcullis House on Wednesday, although she claims a change to passport design is all that is needed, rather than an act of parliament. "Theresa May is aware of the campaign," says Perry, "and could make this happen." Perry has found that an estimated 600,000 women over the last five years have been asked to prove kinship when taking their families through UK border control. She has heard from many women who do not share their children's surname (and it is mostly women – a survey last year found that only 4% of children were given their mother's surname). However, a petition that closes in October so far has just 100 signatures.