In 1 Corinthians 9:5, there is a referrence of women serving the apostles. In most translations, they are called wives:
Don’t we have the right to take a believing wife along with us, as do the other apostles and the Lord’s brothers and Cephas?
On the other hand, I have recently read that the original Greek word is "adelfén", which means a "sister" rather than a "wife". So my question is: is this claim right? Or is the "adelfén" version only in some manuscripts, without being clear what is older? Or is the meaning of word broader than I think? Or is it completely wrong?
EDIT for context: the book where this was written suggests that it was required for a deacon/ priest/ bishop not to live sexually with his wife since his ordination, and the new relationship between them was sometimes compared to that of a brother and a sister. No incest involved, I just try to examine how strongly backed by Scripture is the author's claim that this verse supports that even apostles lived in this kind of celibacy.