Offering Tahajjud Salah With Spouse
In Deen everyting is allowed, unless, there is something unehtical or immoral. Keeping in mind this principle, the question should be asked about such things when there is something unethical or immoral comes up. There is nothing wrong with saying prayer with spouse. In Nafl prayers, you need not to have Jamaat prayer, rahter preferrably, nafl prayers should be performed individually.