Is it permissible to marry one's maternal aunt's daughter after the mother nursed the maternal aunt's daughter, and the maternal aunt nursed two of the questioner's siblings, without specifying the number of nursings, and does the ruling of fosterage cease if the number is not specified?

The prevalent opinion is that prohibitive suckling consists of five sucklings within the first two years (of the child's life). If there is doubt about the existence of suckling or the number of prohibitive sucklings, the prohibition is not established, because the default is its absence. However, it is more prudent to avoid marrying someone with whom there is doubt about suckling, due to the presence of suspicion. The Prophet, peace and blessings be upon him, commanded a man to leave his wife after a woman informed him that she had suckled both him and his wife.