MARINDUQUE, Philippines – Sheila Querubin never thought her sweet tooth would pull her through two of the lowest points so far in her lifetime—her brother and mother’s untimely demise. Now seeing herself ready to move on, she wants to live by her brother’s mantra of paying it forward. Sheila, 41, is an elder sister of Gerald Gene Querubin, Inquirer correspondent in Marinduque, who was also a state college instructor, environmentalist and community worker in the island province. In 2004, Gerald, or “Toots” as he was fondly called by family and…