jaquar

To get the children as dependents they need to be under age 18 or still at home but going to school up to age 28 I believe.
I have the SMC S-1 H.B. and spouse as dependent but my children are all grown and on there own  so no children dependents for me,  just me and my spouse  which is an extra 347.15 above the 100%

Is it possible you mean this benefit regarding the K award?
https://www.law.cornell.edu/uscode/text/38/1114

38 USC 1115 deals entirely with dependents compensation. You have to be over 30% which you have. So, you get X dollars for spouse. Then you get X dollars for each dependent under 18. You have to apply for dependency on a 526 EZ and submit your marriage license for each marriage you've ever been in, divorce decrees (if any), ex wife's SSN, new wife's birth certificate and SSN, birth certificates for each dependent child and so on. VA takes forever to accomplish it. If you take more than a year to submit it they will only go back one year on retro.
True special monthly compensation (SMC), as described in 38 CFR 3.350 is for special circumstances above and beyond 100%. The simplest example is SMC (s) for Housebound. If you are medically determined to be housebound or you have 60% or more above a 100% schedular or TDIU rating, and the extra 60% disabilities are separate and distinct from the 100% rating, then you are awarded (s) which is about $347.15 above and beyond your 100% rating and dependents pay. I'm married (without children) and get $3,415.74. 

Special Monthly Compensation Pay is discussed in 38 USC 1114 and in 38 CFR 3.350.

Is this the regulation you are referring to ?:
https://www.law.cornell.edu/uscode/text/38/1115
CRDP is automatic but CRSC has to be applied for.
The exact criteria for CRSC is here available under a search.
The link I have posted here many times from Military.com has the best info.