Facing problem in receiving signals when process is created using spawnv.

I have used spawnv with NOWAITO parameter and swapned process (childEXE) is expected to handle SIGRTMIN+1 and SIGRTMIN+2
 signals ( tried SIGUSR1 and other as well). 

When I run this process (childEXE) from terminal all the signals expected are received without any issues.

But when same childEXE is spawned using spawnv call, it either receives one signal or none. 

Can somebody help. 

P.S. Trying to run using spawn but having trouble adjusting arguments.

Appreciate help on this.