Visiting India for family emergency, can I request expedited H1B visa interview?

I need to visit India to see my very sick mother-in-law. I am taking children to see her possibly for the last time. I am not getting any visa interview date in July and I have only 4 weeks time off which I am using now. Can I request for an emergency visa date for any date in July. Currently, the only dates showing is in October. I am with same employer (University) all these years and no changes at all. Thanks.