, me & my husband speak in Bengali . So
When he speak to me he use the word for me "TUMI" means YOU and when I speak to him I use the word for him "APNI" meaning YOU. You brother as an Indian very well know what I mean as they are similar words in Indian language as well for e.g.. Aap , tum. So could you clarify me that if I use the same word as my husband "TUMI" is it forbidden or  
Permissible in Islam. Please brother can I some qutationas from Quran & Hadiths. I will be waiting fir your response.
Zazakallah
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