Aloys married Karoline Gräfin von Manderscheid-Blankenheim (Köln, 14 November 1768 - Vienna, 11 June 1831) in Feldsberg on 15 November/16 November 1783.
The ancestral seat was the former moated castle in Oberkail, and because of this, Oberkail gained and maintained considerable importance in the Eifel region for several centuries.
County of Manderscheid, historical state of the Holy Roman Empire centered on Manderscheid, Bernkastel-Wittlich
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Count Sternberg-Manderscheid acquired in the 1803 Reichsdeputationshauptschluss as the landholder, among other things, the holdings formerly belonging to the monasteries at Weissenau and Schussenried in Upper Swabia to offset his loss of Blankenheim, Jünkerath, Gerolstein and Dollendorf.
The chief showing a gold fess dancetty (horizontal zigzag stripe) on a red field is a rendering of the arms formerly borne by the Counts of Manderscheid, although the tinctures are reversed (this might be to comply with the general rule in heraldry that holds that two colours or two metals must not touch).
The castle, mentioned in 1282, on the tuff crags overlooking the village was converted in the 15th or 16th century into a compulsory-labour and toll estate for the Manderscheid toll station on the long-distance trade road running from Liège by way of Malmedy to Koblenz, and into a seat for the comital Schultheißen.