The WTBTS has a policy, but there are plenty that will ignore it as 'blood is thicker than water', specially in the Spanish culture where it seems that we're all about family 1st.
I know of this guy that was an elder and his pioneering daughter found a really good 'worldly' guy that treated her like a queen even 'til this day so I hear; she left the pioneering ranks and married this guy. The elder father attended the wedding and even proudly walked her down the isle.
Although some pushed for him to step down he refused and kept on 'til today. He openly said he'd never not attend one of his children's wedding 'cause they're his family and the ones that will see after him in his old age.
He was right; as much hyped up, no bit 'A' yet and he's now an old man, very needy of his children and they treat him very well because he treated them with respect on their decisions; only one remains a JW.
Like his, there are many non-shunning stories in the Spanish JW ranks; screw the WTBTS, family first then the other shenanigans.