The desk that can act depends on which side of the border they reached. The flood hit the crossing itself, so Nepal and China are running separate responses. If your person was last seen at immigration, say so explicitly and ask your ministry to confirm the case has been raised with both governments — in writing.
Nepal ground lines
Useful whatever passport your family holds.
Singapore
MFA Duty Office
24-hour consular emergency line
+65 6379 8800verified
+65 6379 8855verified
The High Commission in New Delhi deployed a Crisis Response Team into Nepal. Ask to be routed to that team, not left with the Delhi desk.
India
United States
Australia
United Kingdom
Canada
Emergency Watch and Response Centre
Global Affairs Canada, 24/7
+1 613 996 8885verify
sos@international.gc.caverify
Contacts marked verify come from general knowledge rather than this event's advisories. Confirm on the government's own page before relying on them — hotlines rotate during a response.