Cardona, P.J.
Petitioner and respondent are the biological parents of two children, a daughter, born in October 1995, and a son, born in October 1997. The parties met when they were both members of the United States Air Force. Petitioner left military service in 1995 when she became pregnant; respondent, however, remained on active duty. On October 29, 1995, following their daughter's birth, petitioner and the child went to live with respondent's parents in the City of Schenectady, Schenectady County. They resided there until January 1996. Both before and after their marriage in January 1997, the parties' relationship followed what would become a familiar pattern — petitioner and one or both of the children would reside with respondent in either Alabama, where he was at one time stationed, or New York, and difficulties between petitioner and respondent thereafter would develop, following which petitioner would return to Pennsylvania to reside either on her own or with family members. Respondent was discharged from the service sometime in August 1997. The parties resided together in Pennsylvania from early to mid-October 1997, then moved to respondent's parents' home in Schenectady, where they resided until February 1998. At that time, they moved into a house owned by respondent's parents in the City of Gloversville, Fulton County. Ultimately, in October 1998, petitioner and the children left the marital residence and returned to Pennsylvania, a distance of some 247 miles.
Petitioner filed for custody and obtained a temporary order of protection, and respondent cross-petitioned for custody. Pending trial, the parties were awarded joint custody, with physical custody of the children alternating on a weekly basis. At the time of trial, the parties were still married and no divorce proceedings were pending. Following a three-day trial in March 1999 and April 1999, Family Court, inter alia, awarded sole custody to petitioner upon the condition that she relocate to within a 50-mile radius of Gloversville. Petitioner appeals.
Initially, we note that Family Court's custody determination should "not be disturbed unless it lacks a sound and substantial basis in the record" (Osborne v. Osborne, 266 A.D.2d 765, 766). Although this matter cannot properly be characterized as a relocation case inasmuch as it involves an initial custody determination, petitioner's decision to permanently reside in Pennsylvania with the children was a relevant factor for Family Court to consider in its application of the "best interest" analysis (see, id., at 765-766; Matter of Buell v. Buell, 258 A.D.2d 709;Rolls v. Rolls, 243 A.D.2d 906, 907). While the hearing testimony established that petitioner is a competent parent and the children's primary caregiver, who has suitable housing and employment in Pennsylvania where much of her extended family resides, and that respondent showed little involvement with the children when the parties lived together, it also supported Family Court's finding that since the parties' separation, respondent has developed a closer relationship with his children. The record indicates that he has assumed an active parental role, is capable of caring for the children and has maintained a suitable and nurturing home environment. Furthermore, the children have enjoyed a close relationship with respondent's extended family, particularly their grandparents. At the time of the hearing, the weekly four-hour car ride to alternate custody was proving to be very burdensome and, certainly, would not now be practicable since the parties' daughter has attained school age.
Under the totality of the circumstances, it was not improper for Family Court to regard petitioner's decision to reside in a distant locale as "a very important factor" among the constellation of factors it considered in arriving at its best interests determination, since there was evidence that it would detrimentally affect respondent's relationship with his children and their relationship with his extended family (see, Osborne v. Osborne, supra, at 767-768; Matter of Roseboom v. Carreras, 254 A.D.2d 548, 549-550). Notably, we give great deference to Family Court's factual findings, particularly where, as here, they involve the assessment of witness credibility (see, Matter of Grathwol v. Grathwol, 285 A.D.2d 957, 958). Accordingly, we cannot say that Family Court erred when it determined that it was in the children's best interests to award custody to petitioner on the condition that she relocate her residence to within 50 miles of Gloversville.
Mercure and Spain, JJ., concur.