Do you know when Foster relationship may established ?
Assalam alaikum, warahmatullahe wabarkatohu,
Dear brothers and sisters,
we sometimes or many times heard about foster relationship, we all have different relationship, paternal, maternal, marriage relationship etc.
For marriage point of view, it is very important that couples are not mahram because in case of that they can’t marry.
In Islam Foster relationship is also considered same as blood relationship, therefore a boy and a girl can marry with eachother if they have foster relationship.
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In case of foster relationship one thing is most important that the time, meaning age of child when he or she breastfeeding by the lady
So let us know about that in the light of authentic teaching of Prophet Muhammadﷺ –

 Narrated Aisha:
Once the Prophet (saws ) came to me while a man was in my house. He (Prophet pbuh) said, “O `Aisha! Who is this (man)?”
 I replied, “My foster brothers” He (Prophet pbuh) said, “O `Aisha! Be sure about your foster brothers, as
fostership is only valid if it takes place in the suckling period (before two years of age).

Sahih al-Bukhari 2647
In-book : Book 52, Hadith 11

Yahya related to me from Malik from Nafi that Abdullah ibn Umar (ra) said,
 There is no kinship by suckling except for a person who is nursed when he is small.
There is no kinship by suckling over the age of two (2) years.”
Muattah imam malik
 : Book 30, Hadith 1280

From the above hadith it is very clear that –

Suppose there is a girl and a boy who are are not brother and sister by blood, meaning they are not children of same mother or father or parents

,Then they both can marry eachother only if there is no foster relationship between them

And foster relationship only valid if a lady breastfeeding to both and the age of Boy or girl or both was below the two year

Incase if anyone or both were above the two year then foster relationship was not established therefore they can marry with eachother now.