Ryan Sinclair's mother
From Tardis Wiki, the free Doctor Who reference
Ryan Sinclair's mother died of an intense heart attack while doing the washing up when he was thirteen-years-old, with Ryan being the one to discover her body. People would always tell Ryan that he looked like his mother. (TV: The Tsuranga Conundrum)
After she died, Ryan was raised by his paternal grandmother, Grace, as his father, Aaron, had left him, unable to cope. (TV: The Woman Who Fell to Earth, The Tsuranga Conundrum, Resolution)
By 2018, Ryan had come to theorise that his father avoided him because he reminded him of her. (TV: The Tsuranga Conundrum) Ryan eventually forgave his father for not being there for him after the death of his mother. (TV: Resolution)
