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Viewers first met Bill Klein and wife Jennifer Arnold in 2009 when their TLC show, The Little Couple, debuted. Over the course of four years, they've chronicled their experience with skeletal dysplasia, a bone-growth disorder that causes dwarfism, their personal relationship and their road to parenthood. Though they've faced their share of challenges, "I am not a person who gives up," Arnold told PEOPLE in May 2013.
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It was love at first click for Klein, a business owner, and Arnold, a neonatologist, who connected on a dating website. "I could go the next 50 or 100 years with just the two of us, because we have a great relationship," Klein told PEOPLE in 2011. "Few people are so lucky to have that from the moment you meet that one person."
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As a child, Arnold, who is 3'2", dreamt of falling in love and getting married. Together, the couple has tackled years of fertility issues in their devotion to start a family, but their bond has helped them stay strong. "Being a little person, everything is a struggle, and it is wonderful when you achieve something you really wanted," Arnold, reflecting on her quest to find love, told PEOPLE in 2011.
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THE ROAD TO PARENTHOOD
More than a year after the couple's surrogate suffered a heartbreaking miscarriage in 2011, Arnold and Klein found joy again when they adopted a 3-year-old boy with dwarfism named William. "I walk into a room and see him, and I still can't believe he's ours," Klein told PEOPLE in April 2013, a month after announcing their new addition. Arnold added: "We are so deeply in love with him already. It was meant to be."
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THE MORE, THE MERRIER
The couple's family continues to grow, and in May 2013, they announced plans to adopt a 19-month-old girl, Zoey, from India. Months later in October, they finally received approval to bring their daughter home and united as a family in India. "Being a parent is so much better than I expected," Arnold told PEOPLE earlier in the year.
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THEIR LIVES TODAY
Now, The Little Couple is beginning life as a family of four. "We've dealt with prejudice and many challenges," Arnold told PEOPLE earlier this year. "I feel very lucky and fortunate that I have the wonderful life I have."