Is a maternal cousin considered a brother by "radha'a" (milk-kinship) if the maternal aunt let a drop of her breast milk fall into the questioner's nose while she was breastfeeding him?

The prohibitive suckling is that which consists of five sucklings within the first two years of life, whether it is by mouth or by nasal instillation (sa'ut). The majority of jurists consider nasal instillation to be equivalent to suckling in terms of prohibition, citing the hadith: "There is no suckling except that which strengthens the bone and grows the flesh." Prohibition is established by nasal instillation if the milk reaches the stomach or the brain, and the prohibitive limit is five times, provided that common custom considers each time a separate suckling, meaning that milk is poured with the intention of suckling and not merely as drops. So, if milk is expressed and put into the nose in one go or in successive turns, it is considered one suckling. However, if there are five separate instances, they are considered five sucklings and the prohibition is established.