About one in 50 people - approximately one million people in the UK - do not know who their biological father is. It can be a touchy topic for families - with many desperate to meet their parent for their first time.
One woman used social media to find her father - and the pair met for the first time when she surprised him at work. Caitlin McKinney, 18, was raised by her mum and didn't know Bachir until she tracked him down online two years ago.
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