Not clear about your question.
If you are dealing with the estate, then banks, building societies, Local Government will ask you for sight of death certificate. Only then should it be sent - AND IT SHOULD BE A PHOTOCOPY which you send.
Love and Death on Long Island - 1997 is rated/received certificates of: Argentina:13 Australia:M France:U Germany:12 Netherlands:AL UK:15 USA:PG-13
Send in the Dogs - 2008 is rated/received certificates of: Australia:PG
God Send Me a Man - 2009 is rated/received certificates of: USA:PG-13
Send Me No Flowers - 1964 is rated/received certificates of: Australia:G Finland:S Sweden:Btl UK:U
Send in the Clowns I Colombaioni - 1976 TV is rated/received certificates of: Belgium:KT
Well, if you mean how long after a death you should send there card...then I would say no longer than one week. If it is a month or two before you send it, the receiver might think you forgot:/
Death of a Nation - 2010 is rated/received certificates of: USA:R
The Death of Agnes - 1925 is rated/received certificates of: UK:A
Mrs- Death - 1999 is rated/received certificates of: USA:R
Death by Invitation - 1971 is rated/received certificates of: USA:R
Death of a Dynasty - 2003 is rated/received certificates of: USA:R