Can I mail AOS separately from DS 260?

Hi, the deadline for my Green card application is December 31st. Is it ok to send my Green card application such as the DS 260 Form and supporting documents separately from both my mom's and sister's I 864 forms? They live far apart. I intend to send both my mom's and sister's I 864 form together, so that my sister can mail them off together. But this would mean these forms would be sent separately from my other forms such as D 260 and supporting docs. Thanks
 
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