Looked into some of this as I thought might be related to an old friend. They aren't but I'll post what I'd found for others searching.
Family search has:
May 1902 Halifax, Nova Scotia, Canada - Immigration on ship Assyria
Wasyl Petrasz age 54 1848 Nastia Petrasz age 30 1872
Hanka Petrasz age 14 1888 Marya Petrasz age 11 1891
all born Galicia (abrev. as "Gal." so amusingly noted as from Khowst, Afghanistan )
Not positive if this is her husband & his brother's entry or came later with Iwan & the parents
Wasyl Riwniak age 23 b.1881 Galicia, Austria Imm. Apr 1904 Halifax, N.S. Ca. - Ship Arcadia
Dmytro Riwniak Age 24 1881 Austria Imm. Jun 1905 Halifax, N.S. Ca. - Ship Armenia
Seems to match what other Rootschatters had found on the censuses.
Western Land Grant - Wasyl Petrasz - Fraction of 10 27 19 W1
1906 Dauphin District (#2) Subdistrict: 22 (sect: 10 Township 27 range19 west
Petrasca, Wasyl immigration 1903 Nasta Wife 55 Hanna 16 *Maria 14
Immigration from Austria "1903" (Post office: Sifton)
https://central.bac-lac.gc.ca/.item/?app=Census1906&op=img&id=e001202201 - Land Grant - Dmytro Riwniak 1907 NE 31 28 20 W1 149.84 ACRES
- Land Grant - Wasyl Riwniak 1907 sect 10 township 27 range 19 W1 Fraction
1906 - Dauphin District on sect: 22 Twnshp 28 range 20 west (scroll right)
His parents Ruvnak/Riwnak /Rurnak/Ruinak Dmytro 52 & Anna 42 imm. 1906?
Dmytro Jr. married - no wife shown
*Wasyl single - 21 Iwan (a.k.a. John) single -19
Further down on page - enumerated again with different ages but no Maria in household
Wasyl Petrascz age 50, wife Marta 45 dau Hanka? 16
https://central.bac-lac.gc.ca/.item/?app=Census1906&op=img&id=e0012021911916 dauphin census With brother Dmytro & parents Metro & Annie
Rivniak, Wasyl Age: 29 Mary 25 Mch or Mik 6 Annie 5 Stephan 3 Malond? 2 (Marylin? Malosh? Malani?)
https://central.bac-lac.gc.ca/.item/?app=Census1916&op=img&id=31228_4363955-00404- Jan 15, 1913 Death of Maria's father Wasyl Petrasz Dauphin, Mb. - Probate 1919/1920
Wife Nastia dies April 8 1917 Maria the only "heir-at-Law, so perhaps her sister died young
...she signs Rewniak...Sadly it was a long 7 year wait for this to be finalized.
https://www.familysearch.org/ark:/61903/3:1:33S7-811Y-JY2?i=1129&cc=1987562- RIWNIAK ANNIE b. Nov. 20 /1853 d. Nov. 18 /1938 AGE: 84
- REWNIAK DMYTRO d. Dec. 28, 1917 AGE: 68
Dmytro, son of Simon, Probate 1920
Wasyl gets SE 31 28 20 - total 50 acres as do Brothers John
& Mytro ( who gets an extra 10 for taking care of mother Annie)
Flyer from: Rewniak Bros, gen. Merchants, Ukraina, Man. 1917!
was used as a signing sheet for local "tystaments"
...perhaps to prove how long he'd lived on & worked the land.
https://www.familysearch.org/ark:/61903/3:1:33SQ-G111-SWCQ?i=2261&cc=1987562