Out of all the other stars, their star was the brightest. However, the star fizzled out at the end of the episode.
Twelve years ago, sometime after Gumball was born, Richard was surfing the internet. An advertisement for an out of space investment opportunity for the future of your kids appeared on the computer screen, and he accepted the offer on impulse. However, the page had not yet fully loaded when he clicked "yes". The rest of the page stated that the investment would be for the children nine generations in the Watterson bloodline (his children's great great great great great great great grandchildren's children). Richard tried to get the money back, but Stellar Corporation had gone out of business, taking the Watterson's savings with it. Ashamed of his blunder, he did all in his power to hide everything pertaining to the purchase - bank statements, receipts, the certificate for what he bought.