how to fetch record from N:N relationship

Hi All,

I achieved multi-select functionality using standard N:N relationship, using the following link - https://crmtipoftheday.com/47/simple-multi-select-lists-in-crm-2013/

but how can I fetch the record which is associated with a particular record in the subgrid? For example, If I have Contact --> Language N:N relationship so having Subgrid for language on the Contact form, how can I fetch contact which is speaking Language "French" ?? 

In advance find, I didn't find Language in related entity list while querying contact.

Thanks