Teaser 2688: Mother’s Day

From The Sunday Times, 30th March 2014 [link]

Today we are having a family get-together to celebrate Mother’s Day. My maternal grandmother, my mother and I have each written down our date of birth in the form “ddmmyy”. This gives us three six-figure numbers and, surprisingly, both of the ladies’ numbers are multiples of mine. Furthermore, all of the digits from 0 to 9 occur somewhere in the three six-figure numbers.

What is my mother’s six-figure date of birth?

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