I am a bit confused with this brickwall, so any help would be appreciated.

Jane Rankin married Sivert Mortinius Hostad in 1875 Tynemouth residence at the time of marriage was North Shields. Her age is 21 (born approx 1854) father Hugh Rankin brass moulder.
Sivert Mortinius was in sea merchant service.
Their first child Sivert Thomas was born in 1876 Middlesbrough, on his birth certificate his mothers maiden name is Rankin
In 1881 a second child was born Nils (Nellis) Matthew on this record his mothers maiden name is Harrison, they are living 28 station street middlesbrough.
I can't find the family in the 1881 census.
In 1888 Sivert Mortinius dies.

I've found the family in the 1891 census but she is using the name Mary and living with lodger John Dowse. She says she is born 1858 Middlesborough.
Jane Hostad marries John Dowse in 1891 Middlesbrough her father is John Harrison Able Seaman.
In the 1901 and 1911 census the family has moved to Grimsby.

Note- It appears as if there are two different women but so far I have been unable to find a death of Jane Rankin or a marriage to Jane Harrison.
I don't know why she is using the name Mary, it is the only record I have seen her using this name.
The name Hostad has also been spelt Hosted.
This is a previous thread I did on another site but I've started another one so I can bring all the information together
http://www.
rootschat.com/forum/index.php/topic,556493.0.html