Does breastfeeding establish in the two aforementioned cases, or in one of them, and is one suckling sufficient to establish breastfeeding?

Scholars differ regarding the establishment of suckling (رضاع) by the testimony of a single woman. The Hanbalis affirm it if the woman is trustworthy, and this is the preferred view. However, the majority of scholars do not affirm it. The affirming testimony takes precedence over the negating one, as the former includes additional knowledge. A single suckle (رضعة) does not establish prohibtion unless there are five full suckles, according to the soundest opinion among the Hanbalis and the Shafi'i school. Therefore, what the questioner mentioned does not establish a prohibitory relationship (محرمية).