Hi Joanna
1920 US census
Massachusetts, Middlesex County, Medford City
ED 314 Sheet(s) 2a and 2b
ELLIS
Edward F., Head, male, white, 39, married, born MA, both parents born MA. Occupaton: Laborer, Street Department
Mary E., Wife, female, white, 39, married, born Ireland, both parents born Ireland. To USA 1894, naturalized in 1901. No occupation.
If you follow the link I gave you in the message about Agnes, you could order also Mary Ellens naturalization records.
Quite often they include ship arrivals, etc.
Apart from that, I have no way of finding "their" arrivals.
Best regards,
Valerie, aka Grub