Lundstrom in Mass.
A: There are a couple of ways you can approach this research problem. Through the use of conventional census records you may be able to find the new immigrant living with Uncle Lundstrom. Another approach would be to see what other records you can use to get that date more closely to the date of arrival of the immigrant.
It is possible that your research may require some elimination of individuals. This means researching each O. Lundstrom that is found in Everett, Massachusetts. If you were working in one of the states known for the heavy immigration of Scandinavians, this might prove to be an insurmountable task, however, I do not think you will find it to be as difficult in Everett, Massachusetts.
City directories and census may hold the clue.
City directories are often overlooked. People dismiss them as just an alphabetical listing of individuals. They feel they can learn nothing from the directory if they already know where the person lived. This is a mistake. City directories can tell us much more than simply supporting the residency of an ancestor. However, in your case, this is exactly what you need from the city directory.
Unlike the census, which is taken every ten years, city directories are published annually. This allows you to fill in the years between census on ancestors. In some cases it can allude to the death of a spouse, especially the husband, as women are often listed with "(widow of)" after their name with the given name of the husband. Such a valuable resource comes in handy when trying to determine when an ancestor died.
In your case, the city directory would help you by allowing you to see who is living in Everett in 1908, the year the immigrant who was going to stay with "Uncle" Lundstrom appears. Actually you would want to see if you could find both the 1908 and the 1909 city directories. It is possible that in the 1909 the immigrant himself would appear in the alphabetical listing. If he was still living with his uncle, then with the address you would have a better chance of making the connection without question.
Since the immigrant arrived in 1908, the logical step would be to search the 1910 census. Unfortunately there is no Soundex for Massachusetts in 1910. This generally makes searching the census more difficult, especially when working with a large city.
The city of Everett is comprised of six wards in 1910. Those six wards are divided into 15 enumeration districts. Not an insurmountable task, though because of the arrangement of the enumeration districts on the microfilm, you would actually need to look at two rolls of microfilm.
The 1910 Census is found on National Archives microfilm publication T624, comprising 1,784 rolls of microfilm, excluding the Soundex rolls. The state of Massachusetts can be found on rolls 571 through 633. The county of Middlesex is found on rolls 595 through 607.
597 - Middlesex (EDs 765-769, 786-790, 801-811, 1939) County.
598 - Middlesex (EDs 812-831) County.
The 1900 census was Soundexed for Massachusetts. While this is eight years before the arrival of the immigrant in question, it would give you an idea of how many Lundstroms were living in Everett in 1900.
A search of the 1900 Soundex revealed one Olof Lundstrom in Everett. Olof is found in Middlesex County, ED 750, sheet 9, line 95.  He has been married for four years. His wife says she is the mother of one. There is a daughter aged three, and a son age 13. This leads me to believe that Olof is on a second marriage. Also living in the house is a nephew. Olof was born in Sweden and immigrated in 1891. He is naturalized. His nephew, who is 17, was born in Sweden and immigrated in 1900.
This could prove to be the uncle in question. Future research would be necessary.
The census and city directories combined should help with this research in determining who the uncle is. Then it might be possible to discover just how the uncle is related.