Former Little Mix star Jesy Nelson "cannot believe" that her twins have turned one: "What a milestone to reach." The singer, 34, announced earlier this year that her twins Ocean Jade and Story Monroe Nelson were diagnosed SMA1 (spinal muscular atrophy), a genetic condition which causes progressive muscle wastage. On Friday, Nelson posted a heartfelt video featuring the poem “Welcome To Holland” by Emily Perl Kingsley, which addresses the experience of raising a child with a disability. In an accompanying caption, she described her twins as the "strongest most resilient little fighters I’ve ever known". She wrote: "I cannot believe it has been a whole year since having my beautiful baby girls. They have been through so much. There will never be enough words to describe just how incredible they actually are. My tiny little super humans. The strongest, most resilient little fighters I’ve ever known. “You inspire me and every single person that ever meets you both.…