You should try by regular mail to his mother's home. And address it to him in her care and mark it legal documents on the envelope. Have the court send it by regular mail. After that, you should be able to request to file notice by posting.
Pardon me, but that is unalloyed, misleading rubbish!
There is nothing in the Revised Missouri Statutes contemplating that substituted service of process can be effected in any judicial proceedings, including a petition for adoption, by
"regular mail" or at the hands of the petitioner or moving party!
Nor is there any such thing as effecting substituted service of process by your so-called "
posting"! Nor can anything be effectively accomplished in this context by mailing
"in care of".
Try reading some law for a change. (You seem to have ample free time at your work station.) Here try
RSMo Section 506.160.1 Service by mail or publication.
There you would find that substituted service by mailing is solely the responsibility of the clerk of the court. Who upon receiving the appropriate affidavit or verified petition effects substituted service "
by mailing a copy of the summons and petition by registered mail (RR) signed by addressee only addressed to the respondent at the address furnished by the petitioner".
And if the petitioner by means of the verified petition or separate affidavit verifies that the present address of the respondent is unknown, the clerk, if requested, thereupon issues an order for publication of
"a notice to the person concerned of the commencement of the proceeding and stating briefly the object and general nature thereof, etc. "
But again to advise the poster that she can accomplish serving notice on the reputed father of the pending adoption proceeding by "
posting" some form of notice is irresponsible and falsely misleading. Registered mail and publication is the only means of effecting service in lieu of personal service . And if you'll read the Missouri adoption statutes you will learn that such service either personal or if necessary substituted, shall be in accordance with RSMo Section 506.160.
_____________________
AND most revealing is that the above is true in your state of Ohio!
Ohio Rules of Civil Procedure
Rule 4.1 Process: Methods Of Service (A) Service by clerk (1) (a)
" . . . clerk shall deliver a copy of the process and complaint or other document to be served to the United States Postal Service for mailing at the address set forth in the . . . etc."
Rule 4.4 RULE 4.4 Process: Service by Publication
(A) Residence unknown. " . . . t
he clerk shall cause service of notice to be made by publication in a newspaper of general circulation in the county, etc. "
And no where in those Ohio Rules is there any mention of substituting personal service of process by "
posting"!