in case of emergency they dont need ur signature as long as ur wife have ur marriage contract with her together with ur passport copy and the page of the visa for that country ull go to, so that they know that ur not here... and in the hospital they will do all the urgent cases right away....especially in private hospital where ur wife is makin here prenatal check ups or in hamad hospital if ur wife doin the prenatal in the health centers... as far as i know...i hope this helps.... :P