When I was 15, I came home from school on a dismal January afternoon and found my mom sitting cross-legged in the floor of her closet. As I stood in the doorway, my backpack still slung over one shoulder, she told me she was pregnant, due in August.

A high school sophomore just a few months shy of her 16th birthday, I couldn’t fathom the idea that my mom was pregnant. So, my supremely adolescent response to the whole matter was to grab my Sony Discman (still cool in 1998), lace up my sneakers and run out into the sleet and freezing rain. More than an hour later, I returned home with frozen eyelashes and wet clothes and walked right past my mom. I didn’t bring up her news once that night – and eight months later, when my little sister was born, I found various reasons not to make it to the hospital. The afternoon Taylor came home, though, I raced my now-husband up the stairs to peer over the side of her crib (he won the race and maintains that he has known her longer). First place or not, I was instantly hooked.

That day feels like it happened in another lifetime. This Thursday, the baby I fell in love with the moment I saw her will celebrate her twelfth birthday. Over the past 12 years, we’ve watched countless movies together, ridden bicycles in the driveway, done silly dances in our socks on the fireplace hearth, raced down the corridors of an underground mall in Toronto in T’s stroller, gotten our nails done, cheered for the Tar Heels, bought special treats for each other’s dogs, eaten lunch with the Disney princesses and collected their autographs, rocked to the Cheetah Girls, Miley Cyrus and the Jonas Brothers at the local arena, built towering sandcastles in the sand, let the waves crash over our ankles and feet and, best of all, given each other lots of hugs. I thank God every day for the sister I never imagined I’d have or even knew that I wanted. I pray to God every day that the memories won’t have to end.