can they get in trouble?

Some of you may remember the last I made about my husband disappearing. 
Well, he's been gone for 4 days now. No contact whatsoever. I have been crying all day everyday thinking he's dead. I've lost 12 pounds from not eating and stress. We have a 1 year old daughter here, and I'm pregnant and well as having ovarian cancer. I'm not supposed to be alone. Anyways, he went to his moms house. The police began an investigation search for him. Over 100 people on Facebook has shared the post stating he's missing. 
I CONTACTED HIS MOM. She lied saying he wasn't there, never texted, never called. Never seen him. Even after I told her the POLICE are looking for him. 
I'm LIVID. 
My sister was the one who seen him. So I'm wondering, can they get In trouble for this. Can she get in trouble for lying and saying he wasn't there? 

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