Mrs and Mr His Full Name

Even if your fa­ther were John Smith and your mother were Sarah Jones, the con­ven­tion you speak of lists the hus­band’s ti­tle first and uses his name only; you’d say Mr and Mrs John Smith for the mar­ried cou­ple to­gether, and nei­ther Sarah nor Jones would be men­tioned in this us­age. Mrs John Smith would still re­fer to Sarah Jones. Think of Mrs as read­ing “wife of” here.

This prac­tice in which the wife’s name be­comes com­pletely in­vis­i­ble is no longer at all so com­monly heard to­day as it was only a few short gen­er­a­tions ago, but it does still oc­ca­sion­ally sur­face, par­tic­u­larly with older peo­ple.

Some­times young peo­ple have never have heard of it, or may even find it trou­bling. I would not use this style un­less I al­ready knew it to be the cus­tom in your par­tic­u­lar speech com­mu­nity.

In general, it is OK to call them Mr. and Mrs. Piyush Singh, however, there are some (mostly depending on their age) who would find this discriminatory. I would suggest that you stick with introducing them as; Piyush and Seema Singh. or go fully formal and spell out their full names, Mr. Piyush Singh and Mrs. Seema Singh.