Hi Jose:
My Arvelo line is on my mothers side and they are from San Sebastian. This is what I have:
Pablo Arvelo b.1883,bo.Poso. Married Herminia Arvelo. He is the son of Sebastian and Felicita LaTorre. Wife, Ipolito Arvelo and Fermina Rios.. Pablo had daughter, Angelica.
Pablo siblings: Leocadia, Eulalia, Ramon, Matilde, Angel. Herminia siblings: Josefa, Paula, Benicia, Benigna, Rosa, Eusebio, Lesme, Cecilio.

Maria Antonia Arvelo,b.1837, m. Juan Perez Nieves. Maria daughter of Juan Francisco and Ramona Alvarez Medina. Juan, son of Jose Francisco and Rosa Nieves. Maria siblings: Sebastian, Juan Bautista, Julian, Anacleto, Francisco, Ipolito, Paula, Belen.
Children Maria and Juan: Seberiano (my grandfather), Florentina, Domingo, Juan, Juana, Camilo, Gregorio, Tito.
Anacleto Arvelo m.Tomasa Colon. Anacleto son of Juan Bautista and Juana Perez. Tomasa daughter of: Sandalio Colon and Anna Colon (?). Children:Lucia, Isabel, Agenol, Saulo, Gustavo.
Maria Gelbasia Arvelo m.Manuel Colon Rodriguez . I have their children.
Do you conect with any of these famikies ? Hope this helps.
Juan, Moca, PR.